×

Independent beacon based light position system

  • US 9,287,976 B2
  • Filed: 02/08/2012
  • Issued: 03/15/2016
  • Est. Priority Date: 07/26/2011
  • Status: Active Grant
First Claim
Patent Images

1. A method of determining a position of a mobile device when the mobile device is indoors by using asynchronous light sources that each autonomously, and without communication to or from a server, broadcast an identifier as a modulated broadband light signal, the method comprising:

  • capturing, with an image sensor of the mobile device, an image comprising a modulated broadband light signal from one of the asynchronous light sources;

    analyzing the captured image, using the mobile device, to demodulate the modulated broadband light signal from the one asynchronous light source and to determine an identifier specific to the one asynchronous light source; and

    transmitting the identifier determined from the captured image over a wireless communication link from the mobile device to the server, without communication to any light source, to obtain the position of the mobile device without using identifiers from the other asynchronous light sources,wherein the identifier corresponds to a pattern of distortions within the captured image, the pattern of distortions being related to a modulation frequency of the modulated broadband light signal from the one asynchronous light source.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×